I have poured over threads here, articles, forums, google, etc. and found that it is not uncommon for these machines to lose 1-2% per hour while sleeping. No one seems to have a fix. There are lots of things to try which I have - shutting off wifi, bluetooth, notifications, terminal commands to kill TCP processing, wake on bluetooth, hibernation timing, etc. (and @Fishrrman shutting it on and off is not a solution). I have nothing plugged into my machine (USB, ethernet, etc.). Brand new battery with 4 cycle on it that is performing well. I know there are other threads on this here, but I thought I would start a fresh one to see if anyone has found a solution. It just sucks taking my machine out of my bag after a few days to find it dead. I'll try anything, but I fear there is no solution.